Obviously this is way early, and getting the app functional and out is more important, but back when Sync was being developed for Reddit, I remember ljdawson saying he didn't want to add Save Categories because that was a Reddit Gold feature.
Since Lemmy doesn't really have anything similar, would this be something to consider adding in the future?
That's the dream! I used something third party (eternity. sh?) to get past Reddit's limit of only being able to view your last 1000 saves. I think I had over 6000 posts/comments saved. It also enabled me to search through them and narrow them down by subreddit.